Double boiler.



N0. 776,025. PATENTED NOV. 29, 1904. M. J. HILLMAN.

DOUBLE BOILER.

APPLICATION FILED JULY 8. 1904.

N0 MODEL.

STATES.

Patented November 29, 190 1.

PATENT DOUBLE BOILER.

SPECIFICATION forming-part of Letters Patent No. 776,025, dated November29, 1904. Application filed w 8,1904. Serial No. 215,715. (No model) Toall whom, it um/ 7 concern:

Be it known that I, MARILLA J. HILLMAN, a citizen of the United States,residing at Minneapolis, in the county of Henncpin and State ofMinnesota, have invented certain new and useful Improvements in DoubleBoilers; and I do hereby declare the following to be afull, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to that class of cooking utensils generallydesignated as double boilers, and has for its object to improve the samein the several particulars hereinafter noted.

To the aboveends the invention consists of the novel devices andcombinations of devices hereinafter described, and defined in the claim.

The invention is illustrated in the accompanying drawings, wherein likecharacters indicate like parts throughout the several views.

Figure lis a view in transverse vertical section, taken centrallythrough a boiler constructed in accordance with my invention, all theparts thereof being shown as placed in working position. Fig. 2 is asimilar view to Fig. 1, but shows some of the parts removed, as isrequired in some classes of cooking. Fig. 3 is a plan view of the partsshown in Fig. 2, but with the cover of the outer kettle removed. Fig. 4is a detail in elevation, showing a so-called core-piece; and Fig. 5 isa plan view of the same.

The numeral 1 indicates the outer pot of the cooking utensil. Thenumeral 2 indicates the inner pot thereof. The outer 'pot 1 preferablyflares toward its base and near its top is formed with an annularshoulder 23, above which the said pot is formed cylindrical. A cover 4fits into the cylindrical upper end of the pot 1, and the said pot is,as shown, pro vided with a bail 5, by means of which the de vice may becarried.

The inner pot 2 is much shorter and of much less diameter than the outerpot and is formed with an outturnecbflange 6 at its open upper end,which flange hasa plurality of perforations 7 and at its marginalportion is adapted to rest upon the annular shoulder 3 of the outer pot1 to support the said inner pot, as shown in Figs. 1 and 2. As shown, abail 8 is hinged to the flange 6 to afford means for lifting the innerpot to and from operative positions. A detachable cover 9 fits with aquite close joint into the open upper end of the inner pot 2.

The numeral 10 indicates a cylindrical core which at its lower end isrigidly attached to the central portion of a disk-like plate 11. Thecore 10 is preferably open at its upper end and is approximately thesame height as the inner pot 2. The disk or plate 11 is of such sizethat it loosely fits within the pot 2 and affords a false bottomtherefor, as shown in Fig. 1.

Hitherto double boilers consisting of inner and outer pots have beenprovided in which. the water contained within the outer pot andsurrounding the inner pot was confined in a chamber having passages forthe steam extending from the outer pot to the atmosphere, but not intothe upper chamber of the inner pot. In practice I have found that with aboiler thus constructed in cooking the various ground meals, generallydesignated as brealv fast-foods, such foods would not be thor oughlycooked and would not be cooked so as to give the same the best possibleflavor. With my improved boiler when the parts are adjusted as shown inFig. 2 the steam rising from the water surrounding the inner pot andcontained within the outer pot linds free escape upward through theperforations 7 of the supporting-flange 6 and from thence into the pot2, where it commingles with the food which is being cooked, keeps thesame moist, and greatly increases the rapidity and thoroughness of thecooking action.

In cooking brown bread, suet pudding, and some other breads or pastriesthe core 10 is placed in the pot 2, with the disk 11 resting on thebottom thereof, as shown in Fig. 1. Then when, as is usual, it isdesirable to cook such bread or pastries comparatively dry the lid 9 isplaced on the inner pot 2, as shown in Fig. 1. Sometimes, however, it isdesir- "able to cook such bread or pastry moist, and

in this case the cover 9 should be removed, so that the steam may comeinto direct contact with the material being cooked, as shown in Fig. 2,and, furthermore, will then enter the hollow metallic core 10 and willassist in cooking the interior or central portion of the said materialwhich is being cooked.

The annular flange 6 serves to prevent water from boiling over into theinterior of the inner pot 2, since it breaks up the bubbles of theboiling water; but its perforations nevertheless permit the free passageof the steam.

Stirring of the foods while cooking makes them sticky and pasty. Withboilers as hitherto constructed stirring of the food has been necessary.With my improved boiler, however, no stirring is required, since theconjoint action of the hot water surrounding the inner pot and of thesteam commingling with the contents thereof thoroughly cook the foods,as I have found, in about one-half the time required to cook the same inboilers as usually constructed.

The core 10 will project above the top of a baked brown bread orpudding, so that when l the sides thereof are loosened from the kettle2, which may be easily done by running a E knife around the same, thesaid core may be i used as a handle to lift the said loaf 0r pud- I dingout of the kettle without danger ofl breaking the same. The saiddisk-like bottom plate or base 11, as is evident, prevents the loaf orpudding from sticking to the bottom of the kettle 2 and affords asupport therefor.

All parts of the device are preferably constructed of metal. In someinstances they will be galvanized, in some tin, and in others they willbe constructed of what is known as graniteware.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is as follows:

In a double boiler, the combination with an inner kettle and an outerkettle, the former being supported from the latter by means permittingthe passage of steam from the outer kettle into the inner kettle, acover for the outer kettle, and a hollow core, open at its upper end andprovided, at its lower end, with a disk-like base, adapted to fitwithin, and afford a false bottom for, said inner kettle, substantiallyas described.

In testimony whereof I afiiX my signature in presence of two witnesses.

MARILLA J. HILLMAN. lVitnesses:

ROBERT C. MABEY, F. D. MERCHANT.

